Benign Tumors Also called: Benign cancer, Benign neoplasms, Noncancerous tumors Summary Tumors are abnormal growths in your body. They are made up of extra cells. Normally, cells grow and divide to form new cells as your body needs them. When cells grow old, they die, and new cells take their place. Sometimes, this process goes wrong. New cells form when your body does not need them, and old cells do not die when they should. When these extra cells form a mass, it is called a tumor. Tumors can be either benign or malignant. Benign tumors aren’t cancer. Malignant ones are. Benign tumors grow only in one place. They cannot spread or invade other parts of your body. Even so, they can be dangerous if they press on vital organs, such as your brain. Treatment often involves surgery. Benign tumors usually don’t grow back. NIH: National Cancer Institute National Cancer Institute Find an Expert American Cancer Society American Cancer Society National Cancer Institute National Cancer Institute Encyclopedia Atrial myxoma Benign ear cyst or tumor Craniopharyngioma Fibroadenoma – breast Ganglioneuroma Gumma Hemangioma Hemangioma excision – slideshow Hepatic hemangioma Insulinoma Intestinal leiomyoma Juvenile angiofibroma Lacrimal gland tumor Nasal polyps Open lung biopsy Pyogenic granuloma Sebaceous adenoma Sebaceous cyst Seborrheic keratosis Thyroid nodule Tumor Array Biopsy – polyps Cherry angioma Specifics Bone Tumor American Academy of Orthopaedic Surgeons Brain and Spinal Tumors: Hope through Research National Institute of Neurological Disorders and Stroke Chondromyxoid Fibroma American Academy of Orthopaedic Surgeons Chondrosarcoma American Brain Tumor Association Craniopharyngioma American Brain Tumor Association Hand and Wrist Tumors American Society for Surgery of the Hand Hemangioma American Brain Tumor Association Lipoma Mayo Foundation for Medical Education and Research Liver Hemangioma Mayo Foundation for Medical Education and Research Meningioma Mayo Foundation for Medical Education and Research Multiple Endocrine Neoplasia Type I National Institute of Diabetes and Digestive and Kidney Diseases Nasal Polyps Mayo Foundation for Medical Education and Research Osteochondroma (Bone Tumor) American Academy of Orthopaedic Surgeons Pituitary Tumors Mayo Foundation for Medical Education and Research Pituitary Tumors National Institute of Neurological Disorders and Stroke Plantar Fibroma American College of Foot and Ankle Surgeons Plantar Fibroma and Plantar Fibromatosis American Orthopaedic Foot and Ankle Society Prolactinoma National Institute of Diabetes and Digestive and Kidney Diseases Recurrent Respiratory Papillomatosis or Laryngeal Papillomatosis National Institute on Deafness and Other Communication Disorders Schwannoma American Brain Tumor Association Stomach Polyps Mayo Foundation for Medical Education and Research Thyroid Nodules Mayo Foundation for Medical Education and Research Vocal Cord Nodules, Polyps, and Cysts American Academy of Otolaryngology–Head and Neck Surgery What Is Castleman Disease? 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